System.InvalidOperationException: Already closed after updating from iTextSharp 5.3.3 to 5.4.2

Question

I'm getting a System.InvalidOperationException: Already closed exception after updating iTextSharp NuGet package from v. 5.3.3 to 5.4.2.

This happens when I call:

Document doc = new Document(PageSize.A4);
.
.
.

doc.Close(); // Document is already closed hence the exception

It's important to note that this code was working flawlessly with iTextSharp 5.3.3.

I commented that line and the PDF got generated but then iTextSharp started outputting corrupted PDF files that could not be opened by Adobe Reader nor Windows 8 built in PDF reader.

Answer 1

Playing with the code in Visual Studio and taking advantage of IntelliSense I looked at the various possible methods on the Document object. I saw that there is an additional method called CloseDocument(), so I changed this line:

doc.Close();

to

doc.CloseDocument();

and guess what? The thing started working again. No more exceptions. Awesome!

Hope it helps anyone that might encounter this same issue in the future...

---

Well well well... after trying different input options I started getting the exception again...

I was explicitly calling:

pdfReader.Close();

inside an AppendToDocument method. This was happening before calling doc.Close();. Just commented the above line and the exception went away.